CVE-2026-115347

HighCVSS 7.5/10Last modified Oct 22, 2026

Description

Mistune before 3.3.0 contains an inefficient algorithmic complexity vulnerability in parse_link_text that allows remote attackers to cause denial of service through unbalanced square brackets. Attackers can submit markdown containing long runs of unmatched brackets to mistune.html(), triggering repeated forward scans that stall worker processes for minutes.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-407

Affected software

No affected versions have been published.

Timeline

Published
Oct 22, 2026
Last modified
Oct 22, 2026
NVD status
Deferred

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CVE-2026-115347: High severity, CVSS 7.5 | Vulnix